Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfbcf1776419a22…

MALICIOUS

PDF

47.9 KB Created: 2020-10-04 18:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28aa70dd93b471541394f3e6a0c00d23 SHA-1: 5d682d8f987f4176be8ce4730dfca642625df417 SHA-256: cdfbcf1776419a229257eddea100cfd16e69be346ffe535c3cb748ed765d7971
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier as malicious and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a redirector, which in turn likely leads to a malicious site. The presence of numerous links to disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=hellcat+redeye+specs In PDF document text
    • https://site-1038915.mozfiles.com/files/1038915/65145542681.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/25912443316.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/12950654131.pdfIn PDF document text
    • https://site-1039301.mozfiles.com/files/1039301/96085268290.pdfIn PDF document text
    • http://files.eco-logical-resolutions.com/uploads/1/3/1/8/131871614/dozoxerewonites.pdfIn PDF document text
    • http://kiwil.caneskentucky.com/uploads/1/3/0/8/130874600/1629456.pdfIn PDF document text
    • http://files.my-bijoux.nl/uploads/1/3/0/7/130738722/ff180643853.pdfIn PDF document text
    • https://site-1042985.mozfiles.com/files/1042985/87667805129.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/97108176865.pdfIn PDF document text
    • https://site-1039297.mozfiles.com/files/1039297/zixezukanitijas.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/mesanex.pdfIn PDF document text
    • http://files.ohioarea14.org/uploads/1/3/0/7/130775503/timopiz.pdfIn PDF document text
    • http://files.ahta.info/uploads/1/3/1/4/131437491/duxagabudutufuw.pdfIn PDF document text
    • http://zawowaxer.courtenaydore.com/uploads/1/3/1/4/131438405/samonaxoju_safotor_megogi.pdfIn PDF document text
    • http://files.changemanagementassociates.com/uploads/1/3/1/4/131406947/3d777.pdfIn PDF document text
    • http://files.wakevillagecogop.org/uploads/1/3/1/4/131406892/7941545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD2 5132 bytes
SHA-256: b9db6110b891f13c7b2c2c187ed1c46c013d6e6dcd326f9280edaaef210f02f7
font_01_sfnt_off0000815a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 15256 bytes
SHA-256: 2d73ceb911c4f4846f3ffa4f1c4bea357d815879e3d842fbd9eec349b24da36d

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